Asus RT-AC56U bootloop

[sweenytodd]

Hello. Basically I upgraded my existing Merlin firmware that was released back in June 2014 to the latest today. Webpage prompted to restart the router manually so I took of the power cable and re-plugged it again. Now the router is in a boot loop. Every 15 secs the switch LED activity light are flashing, means it rebooting every 15 secs. Recovery mode is not working too. What can I do?

 

[SebZab]

My did the same few days ago. I haven't made firmware update - it worked few month normally and some night died.
Unfortunatelly there is no hope for repair without TTL serial cable. It's totally bricked.

http://forums.smallnetbuilder.com/showthread.php?t=13628